IF SPEAKER WIRE CONNECTIONS CAUSE THE SUBWOOFER TO HUM
Certain receivers use speaker grounding circuits that may be incompatible with external powered
audio products, such as powered subwoofers. When speaker wire is used instead of line level
cables, this incompatibility can result in an audible hum when the receiver is turned off or
switched to a different speaker channel.
If this should happen with your Snell Acoustics subwoofer, you will need to make a ground cable
and connect it to either a RCA line input on the subwoofer and any unused RCA line input or
output on your receiver (see diagram). The proper ground cable for this application should consist
of two male RCA plugs that have their negative outside terminals (or “sleeve”) connected to each
other by any length of single conductor copper cable. The inside positive (or “pin”) terminals
should not be wired in either plug.
If you do not wish to make your own grounding cable, please contact the Snell Acoustics
Customer Service Department directly (see next page) and we will promptly ship one to you of
suitable length at no charge.
single conductor (-) RCA to (-) RCA ground cable
use either RCA jack
Back of Subwoofer
Back of Receiver
use any available
RCA jack
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